Buggy code:
private int maxLines ; private String lineSeparator ; public Alignment memberAlignment ; public boolean needSpace = false ; public int nlsTagCounter ; public int pageWidth ; public boolean pendingSpace = false ; public Scanner scanner ; public int scannerEndPosition ; public int tabLength ; public int indentationSize ; private IRegion [ ] regions ; private IRegion [ ] adaptedRegions ; public int tabChar ; public int numberOfIndentations ; private boolean useTabsOnlyForLeadingIndents ; private final boolean indentEmptyLines ; private static final int INCLUDE_BLOCK_COMMENTS = ( CodeFormatter . F_INCLUDE_COMMENTS ) | ( CodeFormatter . K_MULTI_LINE_COMMENT ) ; private static final int INCLUDE_JAVA_DOC = ( CodeFormatter . F_INCLUDE_COMMENTS ) | ( CodeFormatter . K_JAVA_DOC ) ; private static final int INCLUDE_LINE_COMMENTS = ( CodeFormatter . F_INCLUDE_COMMENTS ) | ( CodeFormatter . K_SINGLE_LINE_COMMENT ) ; private int formatComments = 0 ; private int headerEndPosition = - 1 ; String commentIndentation ; private FormatterCommentParser formatterCommentParser ; Scribe ( CodeFormatterVisitor formatter , long sourceLevel , IRegion [ ] regions , CodeSnippetParsingUtil codeSnippetParsingUtil , boolean includeComments ) { } private void adaptRegions ( ) { } private final void addDeleteEdit ( int start , int end ) { } public final void addInsertEdit ( int insertPosition , String insertedString ) { } private final void addOptimizedReplaceEdit ( int offset , int length , String replacement ) { } public final void addReplaceEdit ( int start , int end , String replacement ) { } public void alignFragment ( Alignment alignment , int fragmentIndex ) { } public void checkNLSTag ( int sourceStart ) { } public Alignment createAlignment ( String name , int mode , int count , int sourceRestart ) { } public Alignment createAlignment ( String name , int mode , int count , int sourceRestart , boolean adjust ) { } public Alignment createAlignment ( String name , int mode , int tieBreakRule , int count , int sourceRestart ) { } public Alignment createAlignment ( String name , int mode , int count , int sourceRestart , int continuationIndent , boolean adjust ) { } public Alignment createAlignment ( String name , int mode , int tieBreakRule , int count , int sourceRestart , int continuationIndent , boolean adjust ) { } public Alignment createMemberAlignment ( String name , int mode , int count , int sourceRestart ) { } public void enterAlignment ( Alignment alignment ) { } public void enterMemberAlignment ( Alignment alignment ) { } public void exitAlignment ( Alignment alignment , boolean discardAlignment ) { } public void exitMemberAlignment ( Alignment alignment ) { } public Alignment getAlignment ( String name ) { } public int getColumnIndentationLevel ( ) { } public final int getCommentIndex ( int position ) { } private IRegion getCoveringRegion ( int offset , int end ) { } private int getCurrentCommentOffset ( int start ) { } public String getEmptyLines ( int linesNumber ) { } private int getIndexOfRegionAt ( int offset ) { } public OptimizedReplaceEdit getLastEdit ( ) { } public final int getLineEnd ( int lineNumber ) { } Alignment getMemberAlignment ( ) { } public String getNewLine ( ) { } public int getNextIndentationLevel ( int someColumn ) { } private String getPreserveEmptyLines ( int count ) { } private IRegion getRegionAt ( int offset ) { } public TextEdit getRootEdit ( ) { } public void handleLineTooLong ( ) { } private boolean hasNLSTag ( int sourceStart ) { } private boolean includesBlockComments ( ) { } private boolean includesJavadocComments ( ) { } private boolean includesLineComments ( ) { } boolean includesComments ( ) { } public void indent ( ) { } public void initializeScanner ( char [ ] compilationUnitSource ) { } private void initFormatterCommentParser ( ) { if ( ( this . formatterCommentParser ) == null ) { <START_BUG> this . formatterCommentParser = new FormatterCommentParser ( null ) ; <END_BUG> } this . formatterCommentParser . scanner . setSource ( this . scanner . source ) ; this . formatterCommentParser . source = this . scanner . source ; this . formatterCommentParser . scanner . lineEnds = this . lineEnds ; this . formatterCommentParser . scanner . linePtr = this . maxLines ; } private boolean isAdaptableRegion ( int offset , int length ) { } private boolean isOnFirstColumn ( int start ) { } private boolean isValidEdit ( OptimizedReplaceEdit edit ) { } private void preserveEmptyLines ( int count , int insertPosition ) { } private void print ( int length , boolean considerSpaceIfAny ) { } private void printBlockComment ( boolean isJavadoc ) { } private boolean printBlockComment ( int currentTokenStartPosition , int currentTokenEndPosition ) { } private void printBlockCommentHeaderLine ( StringBuffer buffer ) { } public void printEndOfCompilationUnit ( ) { } private void printCodeSnippet ( int startPosition , int endPosition ) { } void printComment ( ) { } void printComment ( int kind ) { } void printComment ( int kind , String source , int start , int end , int level ) { } private void printLineComment ( ) { } private void printLineComment ( int commentStart , int commentEnd ) { } public void printEmptyLines ( int linesNumber ) { } private void printEmptyLines ( int linesNumber , int insertPosition ) { } void printIndentationIfNecessary ( ) { } private void printIndentationIfNecessary ( StringBuffer buffer ) { } private void printJavadocBlock ( FormatJavadocBlock block ) { } private int printJavadocBlockNodesNewLines ( FormatJavadocBlock block , FormatJavadocNode node , int previousEnd ) { } private void printJavadocBlockReference ( FormatJavadocBlock block , FormatJavadocReference reference ) { } private int getTextLength ( FormatJavadocBlock block , FormatJavadocText text ) { } void printJavadocComment ( int start , int end ) { } private void printJavadocGapLines ( int textStartPosition , int textEndPosition , int newLines , boolean clearBlankLines , boolean footer , StringBuffer output ) { } private void printJavadocHtmlImmutableTag ( FormatJavadocText text , FormatJavadocBlock block , boolean textOnNewLine ) { }

Fix:
this . formatterCommentParser = new FormatterCommentParser ( this . scanner . sourceLevel ) ;